makes reefing easyBy matthewon 8/23/2014

This auto top off makes my life easy, I have had it for over a year now and have never had a problem.

Wonderful product that has made my life easierBy Davidon 8/15/2014

David would recommend this product to a friend

I was a little skeptical at first installing an auto top off. I had fears or dumping 30 gallons of fresh water into my tank with a faulty device or switch. Having this up and running now for awhile has been great! The sensor is very sensitive and adds small amounts of water throughout the day. I also like the back up float switch. It was easy to set up and the magnets make adjustment simple. I now fill my top off container every several weeks and that's all! One piece of caution is to watch the placement of the top of container as you can get a siphon started. Great product!

Phenomenal!By MCHERRIon 8/5/2014

MCHERRI would recommend this product to a friend

I purchased this device a year ago and I cannot begin to explain how wonderful it has been since. No more daily top off. Now you can just sit back and enjoy your aquarium. Coupled with an automatic feeder, you'll spend less time worrying about your fish and coral, and more time enjoying your tank!

Great PruductBy Crysoson 8/4/2014

Crysos would recommend this product to a friend

I got this about 3 months ago and it is great! Easy setup and it keeps my water where it needs to be. I am home and watching my tank all the time but this is just a great tool to help with top off!

good product recommended.By perryon 7/22/2014

perry would recommend this product to a friend

This is a great product by tunze all-around. the only problem I had with the unit is that the metering bump broke shortly after I received the unit. but I contacted tunze and the quickly replaced the pump at no charge.

Working great. Shutoff redundencyBy Johnon 7/7/2014

John would recommend this product to a friend

I have been using this in my 75 gallon or approximately 18 months. It has been working flawlessly. I originally had the sensor in my display tank and when I introduced a sump, I moved the sensor into my sump. I am using RO/DI water with no Kalkwasser added. I like that there are two mechanisms to shut off the unit if the level is higher than it should be.

The bestBy Jimon 6/27/2014

Jim would recommend this product to a friend

Really not much to say as the product is excellent quality and works. Do yourself a favor and don't cut corners on an ATO.

Simple design with a back up switchBy mfiefon 6/26/2014

mfief would recommend this product to a friend

if you read the directions this is fairly easy to set up. I didn't want to spend the money but in the end it has been worth every penny. I definitely noticed a difference in my corals. instead of adding a half gallon of top off water in the morning and at night this does the job several times through out the day without forgetting.

I love the sensitivity of the optical sensor and the face that there is a back up float valve and alarm as an insurance policy.

The pump is a little noisy and be careful with the magnets, they are strong and will get more than your attention if you pinch yourself with them.

Easy set upBy Joshuaon 5/28/2014

Joshua would recommend this product to a friend

Its working great so far. It only took me about 15 minutes to set it up.

Awesome! Best I have used!By Cornfedoneon 5/5/2014

Cornfedone would recommend this product to a friend

I have had ATOs but this one rocks! Easy setup, I am able to keep topoffs to a minimum so not to disturb ph, all, calcium levels.
All I can really say, is Love This ATO!

LOVE IT!By Shawnaon 5/1/2014

Shawna would recommend this product to a friend

I am SOOOOOO happy that I no longer have to tote around gallons of salt water to top off daily That got old really fast and my tank isn't even that big. This little gadget was easy to mount and works perfectly. Several times throughout the day I'll hear it rev up and top off the tank, keeping my salinity from fluctuating.

AwesomeBy Chrison 5/1/2014

Chris would recommend this product to a friend

I truly wish i would have made this purchase years ago. It was very easy to install and works like a champ.